Earlier quoted context omitted.
Factual accuracy isn't enough to make a comment substantive, and the point about "wage slavery not being much better" is an empty cliché. We're looking for thoughtful discussion here, not throwaway lines. I've posted thousands of comments explaining HN moderation—probably tens of thousands, in fact—so I'll have to differ with you on it lacking "any sort of transparency". What would you like to know?
> What would you like to know? What are the actual rules? You are the most arbitrary and least transparent mod I've ever dealt with. You wield the word "unsubstantive" as a cudgel. You seemingly only hold the goal of stifling discussion that might be against the accepted HN positions. The result is board that yes, does mostly lack flame wars. It's also bland and processed and almost impossible to contribute to, and I…
I can take a crack at replying to your question about those specific comments though. A comment that said only "We live at the absolute _extreme_ of capital power over labor power" would be lame and unsubstantive, but https://news.ycombinator.com/item?id=21983921 went on to say other things that made for a thoughtful comment, though the generic ideological topic (unions-good-or-bad) is a bad one for HN. I don't see why we would moderate a comment like that.
The reply "No we don't, that is called slavery." is lame and pedantic, but I wouldn't call it flamebait. That is the contrarian dynamic which can't resist pointing out a logical flaw in something somebody said. HN has this all over the place, as does everywhere else ("someone is wrong on the internet"...) They are low-quality comments but they don't typically start flamewars unless there is some other baity element in there.
You, on the other hand, have been posting obviously flamebaity and ideological battle comments as well as fuming about "groupthink" and "wrongthink" and downvoting and how awful everything here is. You might find HN less "impossible to contribute to" if you took its intended spirit to heart. You could start with trying for thoughtful conversation and assuming good faith, as well as the rest of what https://news.ycombinator.com/newsguidelines.html ask.